[osg-users] Unbounded growth in OpenFlight ReaderWriter

Daniel Emminizer, Code 5773 dan.emminizer at nrl.navy.mil
Tue Jul 31 08:48:09 PDT 2018

Hi Chris,

I think that would be good.  I have some modifications following Robert’s advice and after more testing I will be posting a PR.  Yes, all of the object caching in OpenFlight plugin is the original code from Brede.  It all dates back to 2006.

I was able to swap to use osgDB::Registry’s object cache with no complications on my end.  I also got to learn more about the object caching system and how it clears out old values.  Thanks Robert for the suggestion to look in this direction.

I ended up posting a PR at https://github.com/openscenegraph/OpenSceneGraph/pull/583 -  It’s low priority since it’s a 12 year old issue, and because it takes a lot of work to get large enough images to crash an app from the problem on modern systems.


- Dan

From: osg-users [mailto:osg-users-bounces at lists.openscenegraph.org] On Behalf Of Chris Hanson
Sent: Tuesday, July 31, 2018 10:40 AM
To: OpenSceneGraph Users
Subject: Re: [osg-users] Unbounded growth in OpenFlight ReaderWriter

I think Brede Johansson wrote that loader once upon a time. I'm hoping to connect with him in Oslo this week. Maybe I'll ask him about this if I do.

On Tue, Jul 31, 2018 at 11:54 AM Daniel Emminizer, Code 5773 <dan.emminizer at nrl.navy.mil<mailto:dan.emminizer at nrl.navy.mil>> wrote:
Hello All,

I've found what appears to be unbounded growth in the OpenFlight loader.  I have a work-around but wanted to run it past the community since there are many here who are more familiar with the format and the loader than me.

I'm seeing uncontrolled memory growth when using the std::istream version of readNode.  It appears to populate the local cache with new images, but never clears out the local cache.  The filename-based version of readNode() does clear out the cache before it returns.

Does it make sense to add in:


... before the return of the ReadResult at the bottom of this method at https://github.com/openscenegraph/OpenSceneGraph/blob/master/src/osgPlugins/OpenFlight/ReaderWriterFLT.cpp#L533 ?

If that's not a good path forward, do you have any suggestions on how to clear the cache on demand?


 - Dan

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